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Science 17 December 1999:
Vol. 286. no. 5448, p. 2229
DOI: 10.1126/science.286.5448.2229b
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This Week in Science

Figure 1
Recent work has shown that Bose-Einstein condensates exhibit superradiance--the interaction between coherent light and the condensate can set up a grating of atoms with well-defined momentum. Kozuma et al. (p. 2309) have controlled this emission process by using a small, well-defined seed condensate and by applying well-timed laser pulses that add more atoms to the grating. They demonstrated amplification of the initial matter wave by a factor of 10. Moreover, they show that this amplification is coherent--it maintained the phase of the initial seed condensate. This matter wave amplifier is analogous to the optical wave amplifier that revolutionized the optical laser.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)